rock block retaining wall, designed in tasmania, leading ... · rock block retaining wall, designed...
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Rock Block retaining wall, designed in Tasmania,
leading the world in “Big Block” retaining walls.
Precast retaining walls have come a long way over the years and Hudson Civil is the leader not
only locally but perhaps in Australia wide when it comes to both innovation and product range.
Starting off with “VEE Blocks” many years ago, wall construction methods have changed every
ten years or so through “Crib”, “Mini-Crib” “L Type panels” through to when we introduced “Mass
bloc™” which revolutionised wall construction in Tasmania. This was the first iteration of a so
called “Big Block” system of walling. Recently we added the “Lock Block”, a “Lego™” type dry
joint system ideal for containment of landscaping materials, tyres etc. International trends
started to follow the USA with their love of faux rock faces on almost all walls they construct.
This has led to the growth of what is known as “Big Block” wall construction with numerous
systems available ‘off the shelf’. We were not happy that the systems on offer were 1) The best
they could be and 2) We don’t want license fees going offshore and also ongoing formwork
purchases having to also be sourced from overseas.
Hudson Civil set about designing the best system we could. The new “Rock Block” wall
system is quite simply the most cost effective, most site friendly, with the fastest
installation currently on offer in the world. The whole system has been designed in house.
Moulds manufactured here and all the intellectual property remains in Tasmania. This is
something we are extremely proud of. This ‘in house’ design gives us the flexibility to adapt
and design a wall to any situation without having to go to a patent owner overseas, we can
adapt quickly and any project specific requirement can be resolved immediately.
What makes Rock Block the best
big block system in the world?
Simplicity In design, construction
& the number of components required
Flexibility Wall can be installed
as a vertical wall, laid back, granular
fill, concrete fill or even reinforced
earth type walls utilising tie rods or
geo grids.
Cost effective Time is money,
this wall is fast. Fast to unload, store
and install. Nothing else comes
close.
ROCK block
Rock Block is unique in that the number of block types is lower than any comparable system.
Our design allows the one standard block to be used as a base block, a standard mid wall
block and a top block. The savings of storage
and handling on site should not be overlooked as
this leads to massive savings during wall
construction.
The only other components you need are corner
blocks and wall capping’s, that’s it, KISS is the
catch cry we have sought to embed in the Rock
Block system.
This simplicity of wall design and wall constriction
does not impede Rock Blocks ability to perform at
any height, with any imposed load. Hudson Civil
offers a free design guide to assist with your wall and can provide a full service if required
including geo technical and structural design, all in house, all performed by Tasmanians.
Rock Block walls are suitable for any earth retaining project including:
The dry stacked construction method combined with the ability to vary both the infill and backfill
materials ensures that any hydraulic and drainage requirements are addressed in any situation.
The hollow nature of the blocks allows larger quantities of ‘facing’ to be transported versus a
solid block system
ROCK block
Quite simply, your next wall should be a Hudson Civil
wall and that wall should be a Rock Block wall
• Mass gravity walls
• Seawalls
• Reinforced soil walls
• Bridge Abutments
• Wingwalls
Rock Block retaining wall detail is presented in this manual is indicative only. Maximum heights and toe embedments have been determined using assumed site features, soil properties, construction processes, and loading conditions and may not be applicable to specific sites. Design and construction methodology must be undertaken by an appropriately qualified Engineer taking site properties and in-service conditions into account.
30 35 45
Level No. Blocks 5 6 7
0 kPa Height 2200 2700 3250
Toe embedment 300 300 250
1:10 No. Blocks 4 5 6
0 kPa Height 1800 2300 2800
Toe embedment 200 200 200
Level No. Blocks 4 5 6
5 kPa Height 1700 2200 2700
Toe embedment 300 300 300
Backfill slope
Backfill surcharge
ROCKBLOCK Retaining Wall
Soil friction angle
Backfill slope
Backfill surcharge
Backfill slope
Backfill surcharge
ROCK block
ROCK Block set back
45mm each 500mm
high course
ROCK Block
Retaining Wall
Height
Free Draining 20mm
Crushed Rock Cavity
Fill
Overland Flow Cut Off
Drain
Temporary Batter
Non-Reactive Granular
Backfill
100mm Sub Soil Drain
Away From Base of Wall
Compacted Crush Rock, 250
kPa Allowable Bearing Capacity
Base
Thickness
Toe Embedment
200mm
The simplicity of the Rock block’s design comes to the fore when higher walls requiring additional support are required. The flat surfaces of both the upper and bottom faces of the Rock block allow for safer use of Geogrids as there are no ‘knobs’ to shear or punch holes in to the geo grid you can have absolute confidence that the Geogrid is acting to 100% of its potential.
Please contact your local Hudson Civil office to discuss your retaining wall requirements as we have many solutions available.
MASS Bloc LOCK Block ROCK Block
ROCK block
ROCK Block
Retaining Wall
Height
Free Draining 20mm
Crushed Rock Cavity
Fill
Overland Flow Cut Off
Drain
Temporary
Batter
Non-Reactive
Granular
Backfill
100mm Sub
Soil Drain
Away From
Base of Wall
Compacted Crush Rock, 250
kPa Allowable Bearing Capacity
Base
Thickness
Toe Embedment
200mm GEOGRID as
Required
STANDARD BLOCK
The “workhorse block” is the key to why our
design is so unique. This one block used as
a Base, Intermediate and Top block.
1500mm x 500mm x 900mm Deep (plus 100mm “toe” when used as a base block)
FULL CORNER BLOCK
1500 mm x 500mm x 750mm Deep Left or Right Handed Blocks are solid
HALF CORNER BLOCK
750 mm x 500mm x 750mm Deep Left or Right Handed
Blocks are solid
ALL ROCK Blocks utilise the
modern “Swift Lift” system for
enhanced safety.
ROCK block
Capping Stones also available
Design your ROCK Block wall here
1. Wall Height (Ground level to Top of Wall)……………
2. Wall Length ……………..
3. Please sketch a typical section of your wall below, include any roads, buildings and other items that may influence the design.
ROCK block
Rock Block RETAINING
WALL HEIGHT
100 DIA SLOTTED SUB SOIL
DRAIN, DRAIN AWAY FROM
RETAINING WALL BASECOMPACTED CRUSHED ROCK
250 kPa ALLOWABLE BEARING
CAPACITY